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系統識別號 U0026-1808201421165100
論文名稱(中文) 脈動式管流初始不穩定之現象探討
論文名稱(英文) The study of the initial unstable disturbances in pulsating pipe flow
校院名稱 成功大學
系所名稱(中) 航空太空工程學系
系所名稱(英) Department of Aeronautics & Astronautics
學年度 102
學期 2
出版年 103
研究生(中文) 簡廷瑋
研究生(英文) Ting-Wei Jian
學號 P46014422
學位類別 碩士
語文別 中文
論文頁數 93頁
口試委員 口試委員-周榮華
口試委員-苗君易
口試委員-呂宗行
中文關鍵字 脈動式管流  不穩定擾動  EMD  HHT  微機電熱膜感測器 
英文關鍵字 pulsating pipe flow  unstable disturbance  Empirical Mode Decomposition  MEMS thermal-film sensor 
學科別分類
中文摘要 本研究主要探討脈動式管流之初始不穩定現象,利用馬達驅使管流下游檔板(流場控制器)旋轉,造成管內流速隨時間變化產生出脈動式的變化週期,使用熱線測速儀量測流場之速度,並搭配實驗室製作之熱膜感測器黏貼於壁面沿著展向方向40°量測。此脈動是非定常管流之主要參數為Womersley number、平均雷諾數、震盪雷諾數,藉由改變參數找出初始擾動。利用Hilbert-Huang Transform及Wavelet來計算不穩定擾動之特徵頻率。此外,使用熱膜感測器觀察管壁展向特性,並利用Ensemble Empirical Mode Decomposition除去背景訊號取出不穩定擾動之分量,並藉由交叉相關性分析,可以分辨出不穩定擾動之二維及三維特性。經由實驗及數據分析處理,嘗試運用Rayleigh instability 解釋其物理機制。
英文摘要 The study discuss with initial instability of pulsating pipe flow, which was produced by a circular disk in rotation at the downstream end of the pipe flow. In the experiment, the velocity measurements were made by a boundary type hot-wire. The spanwise characteristics of unstable disturbances were observed by MEMS thermal-film sensors flushed with the wall across 40 degrees in the azimuthal direction. The flow can be characterized by three experimental parameters, the Reynolds number based on the time-mean velocity, the Reynolds number based on the pulsating velocity amplitude and the Womersley Number representing the non-dimensional frequency of the pulsating flow. Moreover, MEMS thermal-film sensors observed the characteristics of the wal1, using Ensemble Empirical Mode Decomposition remove background signal and obtained unstable components, and by cross-correlation analysis can distinguish two and three dimensional characteristics of unstable disturbances. The results obtained indicate that the unstable disturbances are developed when the flow near the wall is in the deceleration, and are occurred at the radial positions where the inflection points took place. Using the theory of Rayleigh instability explain the physical phenomena.
論文目次 中文摘要 ..................................................I
Abstract.................................................II
致謝......................................................VI
目錄.....................................................VII
表目錄.....................................................X
圖目錄....................................................XI
符號說明...............................................XVIII
第一章 緒論..............................................1
1.1 研究動機與目的......................................1
1.2 文獻回顧...........................................1
1.2.1 層紊流轉換.........................................1
1.2.2 定常管流...........................................3
1.2.3 非定常管流.........................................4
1.2.4 瞬變管流...........................................4
1.2.5 週期性管流.........................................4
第二章 實驗設備...........................................8
2.1 管流設備...........................................8
2.2 流場控制器(Flow controller)........................8
2.3 壓力孔(Pressure tap)..............................9
2.4 壓力轉換器(Pressure transducer)....................9
2.5 定溫型熱線測速儀(Constant temperature hotwire anemometer)..............................................9
2.6 訊號截取系統.......................................10
2.7 MEMS熱膜感測器....................................10
第三章 實驗量測與訊號分析方法..............................13
3.1 流場量測方法......................................13
3.2 Hilbert Huang transformation (HHT)..............13
3.3 Empirical Mode Decomposition(EMD)...............13
3.4 Ensemble Empirical Mode Decomposition (EEMD)....14
3.5 Hilbert transformation(HT)......................15
3.6 交叉相關性分析.....................................15
3.7 小波轉換(Wavelet Transformtion)...................16
3.8 實驗參數..........................................17
3.8.1 Womersley number.................................17
3.8.2 平均流速雷諾數(ReU)................................17
3.8.3 速度震盪雷諾數(Rem)................................17
第四章 結果與討論........................................18
4.1 流場基本特性.......................................18
4.1.1 檔板的選用.........................................18
4.2 擾動之相位分佈......................................19
4.3 MEMS sensor三維性量測..............................22
4.3.1 運用EEMD拆解出MEMS sensor之擾動訊號..................23
4.3.2 二維擾動定義.......................................23
4.3.3 二維擾動的觀察.....................................24
4.4 不穩定擾動之特徵頻率................................26
第五章 結論.............................................28
5.1 結論.............................................28
5.2 未來工作與建議.....................................29
Reference...............................................31

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